I have digital cable hooked up to a receiver with R/L cables. On some channels all speakers will play audio. In quite a good 5.1 surround mix, Especially the discovery channels. Others not even the R/L will play and it will only be the center channel. Can someone explain how this works, and what is occuring, and will there ever be a 5.1 output for digital cable? If not why not? Can the cable not carry that type of audio signal?